Collapsible containers with transparent side walls

ABSTRACT

Disclosed is a collapsible container, such as an above-ground pool, having side walls with some level of transparency. The container may include a base, a side wall joined to the base, and at least one transparent portion of the side wall. The transparent portion may comprise a clear material strong enough to support the pool structure without the need for a reinforcing material. Such a design may be stronger, more durable, and allow for clearer viewing than conventional above-ground pools employing conventional portholes. Such a design may allow for larger portions of transparent material than traditional pools. For example, in some embodiments, half of the side wall could comprise a transparent portion. In some embodiments, the entire side wall could comprise a transparent portion. Additionally, the pool may have improved portability and storability characteristics that are superior to those of conventional pools.

TECHNICAL FIELD

The present disclosure relates to collapsible containers and, more specifically, to swimming pools having a level of transparency on a side wall.

BACKGROUND

A variety of above-ground swimming pools are known. Some are inflatable and have hollow inflatable side walls capable of containing water, whereas others are known as frame pools. The most common type of frame pool is formed from molded plastic and can permanently take on the shape of a small, portable swimming pool. Such pools can be manufactured in a variety of shapes and sizes, thereby allowing a consumer to choose a pool that suits their particular needs.

One problem with conventional above-ground pools, however, is that there is that they do not provide an adult, who is on the ground outside of the pool, with any opportunity to see what is going on inside of the pool. But as will be appreciated, it's desirable for a person to be able to see inside the pool from the outside as this provides a way for the person to watch what is happening inside of the pool without getting in the pool. A parent, for example, could watch his or her children as they swim in the pool, thereby increasing the child's safety without requiring the parent to get wet. Likewise, it is enjoyable for a person in the pool, such as a child, to be able to watch and communicate with people outside the pool. Windows and portholes can provide this functionality. But generally, there are not windows or portholes in conventional above-ground pools. And though attempts have been made to manufacture pools with a level of transparency in the side walls, specifically pools with portholes or windows, these attempts have encountered several quality related obstacles. Commonly, for example, the portholes and windows lack sufficient structural integrity, and they often leak or cause structural failure, thereby shortening the useful life of the pool.

BRIEF SUMMARY

Aspects of the present disclosure relate to above ground pools having a level of transparency on a side wall in with the transparent portion is sufficiently strong to prevent leaks and structural failure. Additionally, aspects of the present disclosure relate to above ground pools having windows or portholes in which the transparent portion is sufficiently transparent as to allow for two-way viewing (i.e., both into and out of the pool). Specifically, the present disclosure describes a collapsible container with improved portholes. An embodiment of the present disclosure can provide a pool comprising: a base; a side wall joined to the base, the side wall comprising: an aperture; an outer wall; and an inner wall, the inner wall capable of sealing to the outer wall; and at least one porthole comprising: a first window sheet layer made from a plastic; and a second window sheet layer made from the plastic, the at least one porthole being disposed between the inner wall and the outer wall and attached thereto by at least two welds that are each continuous around the perimeter of the aperture, wherein the porthole is configured to substantially cover the aperture.

In any of the embodiments disclosed herein, the window sheet can be transparent, and the side wall can be not transparent.

In any of the embodiments disclosed herein, the plastic can comprise polyvinyl chloride (PVC) and a plasticizer.

In any of the embodiments disclosed herein, the plastic can confer to the at least one porthole a tensile strength of 2000 to 3000 kPa when the at least one porthole undergoes a tensile test in one or more of a horizontal or vertical direction.

In any of the embodiments disclosed herein, the at least one porthole can withstand an applied force of up to 20,000 gf before failing.

In any of the embodiments disclosed herein, the at least two welds can include three welds that are continuous around the perimeter of the aperture.

In any of the embodiments disclosed herein, the side wall can comprise two or more side wall sections.

In any of the embodiments disclosed herein, each of the two or more sidewall sections can comprise a porthole.

In any of the embodiments disclosed herein, the side wall can comprise a unitary side wall sheet.

Another embodiment of the present disclosure can provide a pool comprising: a base; a side wall comprising: a first side wall section having a first edge, the first side wall section comprising: an outer wall; and an inner wall, the inner wall capable of sealing to the outer wall; and a second side wall section having a second edge, the second side wall section comprising: a first window sheet layer made from a plastic; and a second window sheet layer made from the plastic, wherein the second edge of the second side wall section is configured to join the first edge of the first side wall section at a joint and be attached thereto by at least two welds that are each continuous along the joint, wherein each side wall section is joined to the base.

In any of the embodiments disclosed herein, the second side wall section can be transparent, and the first side wall section can be not transparent.

In any of the embodiments disclosed herein, the plastic can comprise polyvinyl chloride (PVC) and a plasticizer.

In any of the embodiments disclosed herein, the second side wall section can have a tensile strength from 2000 to 3000 kPa when the second side wall section undergoes a tensile test in one or more of a horizontal or vertical direction.

In any of the embodiments disclosed herein, the second side wall section can withstand an applied force of up to 20,000 gf before failing.

In any of the embodiments disclosed herein, the first side wall section can be joined to one or more adjacent side wall sections and the base by one or more welds that are continuous around the perimeter of the first side wall section.

In any of the embodiments disclosed herein, the first side wall section can comprise a porthole containing an aperture and a window sheet disposed within the aperture.

In any of the embodiments disclosed herein, the window sheet can be joined to the aperture through one or more welds around the perimeter of the aperture.

In any of the embodiments disclosed herein, the window sheet can be made from the plastic.

Another embodiment of the present disclosure can provide a pool comprising: a base; and a side wall comprising a window sheet comprising a transparent material including a plastic and a plasticizer, and the side wall forming a unitary transparent sheet configured to enclose an interior area of the pool, wherein the side wall is joined to the base through one or more welds.

In any of the embodiments disclosed herein, the plastic can comprise polyvinyl chloride (PVC).

In any of the embodiments disclosed herein, the side wall can have a tensile strength from 2000 to 3000 kPa when the first window sheet undergoes a tensile test in one or more of a horizontal or vertical direction.

In any of the embodiments disclosed herein, the side wall can withstand an applied force of up to 20,000 gf before failing.

In any of the embodiments disclosed herein, the side wall can further comprise a flotation device having the shape of the interior area of the pool and disposed around a top portion of the side wall.

In any of the embodiments disclosed herein, the flotation device can comprise the transparent material.

Another embodiment of the present disclosure can provide a pool comprising: a base; and a side wall joined to the base, the side wall comprising: an aperture; and at least one porthole substantially covering the aperture, the at least one porthole comprising: a first window sheet layer made from a plastic; and a second window sheet layer made from the plastic, the at least one porthole covering the aperture and attached to the side wall by at least two welds that are each continuous around the perimeter of the aperture.

In any of the embodiments disclosed herein, the plastic can confer to the at least one porthole a tensile strength of 2000 to 3000 kPa when the at least one porthole undergoes a tensile test in one or more of a horizontal or vertical direction.

In any of the embodiments disclosed herein, the at least one porthole can withstand an applied force of up to 20,000 gf before failing.

Also disclosed herein are methods for making the previously discussed embodiments.

Further features of the disclosed technology, and the advantages offered thereby, are explained in greater detail hereinafter with reference to specific embodiments illustrated in the accompanying drawings, wherein like elements are indicated by like reference designators. Reference will now be made to the accompanying figures, which are not necessarily drawn to scale.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of a container having transparent portions, in accordance with some embodiments of the present disclosure.

FIG. 2 is a perspective view of another container having transparent portions and braces, in accordance with some embodiments of the present disclosure.

FIG. 3 is a perspective view of the exterior of a container having both rectangular- and circular-shaped transparent portions, in accordance with some embodiments of the present disclosure.

FIG. 4 is perspective view of the exterior of a container having a circular-shaped transparent portion, in accordance with some embodiments of the present disclosure.

FIG. 5a is an interior view of a container having a rectangular-shaped transparent portion, in accordance with some embodiments of the present disclosure.

FIG. 5b is an interior view of a container having circular-shaped transparent portions, in accordance with some embodiments of the present disclosure.

FIG. 6a is a view of the exterior of a container having a rectangular-shaped transparent portion, in accordance with some embodiments of the present disclosure.

FIG. 6b is a view of the exterior of a container having a circular-shaped transparent portion, in accordance with some embodiments of the present disclosure.

FIG. 7 is an additional view of the exterior of a container having a circular-shaped transparent portion, in accordance with some embodiments of the present disclosure.

FIG. 8a is a graph showing the results of material tensile tests in the vertical direction for a rectangular sample of a transparent material.

FIG. 8b is a graph showing the results of material tensile tests in the horizontal direction for a rectangular sample of a transparent material.

FIG. 9 is a graph showing the results of material tensile tests for a rectangular sample of a non-transparent material.

FIG. 10 is a graph showing the results of material tensile tests for a weld between a transparent and non-transparent material.

DETAILED DESCRIPTION

To facilitate an understanding of the principles and features of the various embodiments of the disclosure, various illustrative embodiments are explained below. Although embodiments of the disclosure are explained in detail as being systems and methods for a container with improved portholes, it is to be understood that other embodiments are contemplated, such as embodiments employing other types of containers, portholes, windows, materials, pools, and the like.

As described above, a problem with existing above-ground pools is that they typically do not provide transparency of the side walls. And in conventional pools that do have transparent portions of the side walls, the transparent portions cause leaks and compromise the structural integrity of the pool. More specifically, in conventional designs, water pressure can cause the welds between the transparent portions and side wall of the pool to weaken and eventually leak or rupture. The lack of strength has led to conventional transparent portions being limited in size. Also, as described, attempts to strengthen transparent portions have required the use of a mesh liner within the transparent portion that decreases the clarity of the transparent portions, thereby reducing visibility, and reduces the pool's overall flexibility, thereby affecting the ability to store the pool. Both results are undesirable.

In some embodiments, a pool can be provided that includes a base, a side wall, and at least one transparent porthole. The transparent portholes can (contain) comprise a window sheet made of a transparent material such as PVC. The window sheets can be welded to the side wall to prevent leaks and maintain structural integrity. The transparent material can be provided such that no additional support or mesh is required. As will be appreciated, such embodiments allow for an unobstructed porthole that can maintain structural integrity without failing. In some embodiments, in addition to being substantially transparent, the provided PVC provides sufficient material properties to maintain the pool structure when in use. Such properties can include, but are not limited to: tensile strength, flexural strength, elastic modulus, and many others known to one of skill in the art. In some embodiments, the entire side wall can be made from the transparent material. In other embodiments, the side wall comprises side wall sections wherein some of the side wall sections are made from transparent material and other sections are made from opaque or substantially opaque material. In such an embodiment, the transparent sections can be arranged by a user to create many different designs and patterns. As would be appreciated by one of skill in the art, since the transparent material can have material properties and strength sufficient to maintain the pool structural integrity, any portion of the side wall can contain any amount of transparent material without compromising the structural integrity of the pool. In other words, no matter how much or little transparent material is contained in the side wall, the pool can still structurally retain its initial functionality.

In some embodiments, pools are formed by joining a base, along its perimeter, to an erected side wall at or near one edge of the side wall (i.e., at the bottom edge). Along the edge of the side wall not joined to the base (i.e., the top edge), either an upward-force-providing member or a shape-retaining member, or a combination of the two, may be positioned. The upward-force-providing member or shape-retaining member generally has at least a portion coupled proximate the end of the side wall not joined to the base (i.e., the top of the side wall). The upward-force-providing member may comprise a variety of different elements capable of aiding the transformation of the collapsible container from a collapsed configuration to an expanded configuration. For example, the upward-force-providing member might be a floating device that floats on liquid deposited in the container, thereby causing the side wall to rise as more liquid is deposited in the container. The upward-force-providing member also may be a ring attached to the side wall and supported by support members.

A support member and/or shape-retaining member may be formed from one or more support members having at least a portion coupled proximate to the side wall of the pool. For example, vertical rib supports may be used as an upward-force-providing member, a shape-retaining member, or both. Such vertical ribs may be formed from individual inflatable portions, or may be configured as a foam insert, metal or polymer rod, or the like. According to some embodiments, such vertical ribs may be collapsible, being formed from collapsible inflatable portions, collapsible foam portions, or other suitable compositions.

Accordingly, it is not intended that the disclosure is limited in its scope to the details of construction and arrangement of components set forth in the following description or examples. The disclosed technology is capable of other embodiments and of being practiced or carried out in various ways. Also, in describing the embodiments, specific terminology will be resorted to for the sake of clarity. It is intended that each term contemplates its broadest meaning as understood by those skilled in the art and includes all technical equivalents which operate in a similar manner to accomplish a similar purpose.

It must also be noted that, as used in the specification and the appended claims, the singular forms “a,” “an” and “the” include plural references unless the context clearly dictates otherwise. For example, reference to a component is intended also to include composition of a plurality of components. References to a composition containing “a” constituent is intended to include other constituents in addition to the one named.

Ranges may be expressed herein as from “about” or “approximately” or “substantially” one particular value and/or to “about” or “approximately” or “substantially” another particular value. When such a range is expressed, other embodiments include from the one particular value and/or to the other particular value.

By “comprising” or “containing” or “including” it is meant that at least the named compound, element, particle, or method step is present in the composition or article or method, but does not exclude the presence of other compounds, materials, particles, method steps, even if the other such compounds, material, particles, method steps have the same function as what is named.

It is also to be understood that the mention of one or more method steps does not preclude the presence of additional method steps or intervening method steps between those steps expressly identified. Similarly, it is also to be understood that the mention of one or more components in a composition does not preclude the presence of additional components than those expressly identified.

The materials described as making up the various elements of the technology are intended to be illustrative and not restrictive. Many suitable materials that would perform the same or a similar function as the materials described herein are intended to be embraced within the scope of the disclosure. Such other materials not described herein may include, but are not limited to, for example, materials that are developed after the time of the development of the technology.

To facilitate an understanding of the principles and features of this disclosure, various illustrative embodiments are explained below. In particular, various embodiments of this disclosure are described as a pool with transparent side walls. Some embodiments of the disclosure, however, may be applicable to other contexts, and embodiments employing these applications are contemplated. For example, and not limitation, some embodiments of the disclosure may be applicable to various types of containers wherein the ability to see inside or outside of the container is desired, or wherein improved portability is desired. Accordingly, where terms such as “pool” or “side wall” or related terms are used throughout this disclosure, it will be understood that other devices, entities, objects, or activities may take the place of these in various embodiments of the disclosure.

According to an embodiment of the disclosed technology, FIG. 1 shows a container, or swimming pool, comprising a side wall with transparent portions. As shown in FIG. 1, an above-ground swimming pool (hereinafter “pool”) 100 can have a base 110, a side wall 120, and portholes 150.

As shown in FIGS. 1-4, pool 100 may comprise a single porthole 150, or a plurality thereof. Portholes 150 may be similar to a window permitting one to see into the inside of pool 100 or out of pool 100. Portholes 150 may further enable one to determine the level of liquid within pool 100.

As also shown, for example, in FIGS. 1 and 2, the portholes 150 may be of a particular shape. In some embodiments, the shape of the portholes 150 may be determined by the shape of apertures cut into the walls 126, 128 of the pool 100. As shown in FIG. 1, the shape of the portholes 150 may be elliptical or substantially elliptical. As shown in FIG. 2, in some embodiments, the shape of the portholes 150 may be circular or substantially circular. As shown in FIG. 5a , in some embodiments, the shape of the portholes may be substantially rectangular with rounded corners. As will be apparent to one skilled in the art, however, the porthole 150 may be configured as any suitable shape, such as square, rectangular, oblong, and the like. Additionally, in some embodiments, and as shown in FIGS. 1 and 2, the portholes 150 may be spaced evenly about the side wall 120.

FIGS. 5a and 5b illustrate two shapes for portholes 150 as viewed from the inside of the pool 100. Portholes 150 may comprise a generally transparent window sheet 500 that is attached to the side wall 120 (or inner wall 126). The window sheet 500 may be attached to the side wall 120 by welding the window sheet 500 to the side wall 120 with one or more welds 510. In some embodiments, the welds 510 may be made around the circumference of the aperture cut into the side wall 120 and may have substantially the same shape as the aperture. The welds 510 may be continuous welds, which may help prevent the fluid in the pool 100 from leaking. Successive welds 510 may be concentric and further from the center of the aperture in side wall 120, as illustrated in FIGS. 5a and 5 b. Specifically, there may be two, three, four, five, or more welds 510 moving outward from the center of the aperture in the side wall 120. As will be appreciated, the successive welds 510 may aid in reinforcing the pothole 150 to make it more durable than known portholes. That is, since there may be a plurality of welds 510, if one weld 510 fails, the other welds 510 may maintain the integrity of the porthole 150 and thus the pool 100. Alternatively, or additionally, the window sheet 500 may be attached to the side wall 120 by using an adhesive substance.

Window sheet 500 may be substantially similar in shape to the aperture in side wall 120, but it also may differ in shape. If window sheet 500 is a different shape than the aperture it covers, window sheet 500 still may be attached by welding or adhesive, but the welds need not be concentric. For example, there may be a first weld near the outer edge of window sheet 500, and a second weld closer to and surrounding the aperture in the wall.

In some embodiments, window sheet 500 may comprise a clear flexible polymer, such as flexible PVC. In some embodiments, side wall 120 (or inner wall 126) also may be a flexible polymer, such as flexible PVC. As will be appreciated, use of two similar materials may make attaching window sheet 500 and side wall 120 easier and also increase the strength of the attachment. Specifically, in some embodiments, such as embodiments employing high frequency welding (or RF welding) to form welds 510, it can be desirable to have materials with similar melting points and chemical compositions to form a stronger weld 510 and make the welding process less complex, as will be understood by one of skill in the art.

In some embodiments, porthole 150 may further include two additional components. As shown in FIGS. 5a and 5 b, porthole 150 may comprise a clear window sheet 500 attached to side wall 120 of pool 100. In some embodiments, window sheet 500 may be attached to inner wall 126 or outer wall 128 of side wall 120 of pool 100. Moreover, window sheet 500 may be attached between inner wall 126 and outer wall 128. In other words, window sheet 500 may be “sandwiched” to and between inner wall 126 and outer wall 128, and attached to both walls by conventional means, such as by weld 510, adhesive, or the like. In some embodiments, therefore, the shape of porthole 150 may be determined by the shape of the apertures cut into walls 126, 128.

FIGS. 6a and 6b illustrate alternative portholes 150 comprising clear window sheet 500 welded to pool sidewall 120. In some embodiments, the window sheet 500 can be attached to side wall 120 by securing it between inner wall and outer wall. In such an embodiment, welding or adhesives may be used in a manner similar to that discussed above with respect to FIGS. 5a and 5 b. As shown, welds can be used to fasten window sheet 500 to the sidewalls providing substantially enclosed welds between the sidewalls. In other words, window sheet 500 can be sandwiched between an inner wall and an outer wall and welded for robustness and security. Such an embodiment would provide a robust seal of the window sheet to the sidewall while simultaneously encasing the welds to protect the welds and ensure long life times of the welds. Additionally, the sandwiched window sheet can provide for a smoother connection to the side wall and cleaner overall appearance when in use.

The increased strength of portholes disclosed herein may enable the portholes (e.g. porthole 150) to be larger in size than conventional portholes. Traditionally, portholes were limited in size due to the stress exerted on the portholes by the water pressure. But portholes in accordance with the present disclosure (e.g., porthole 150) may be larger than existing portholes due to their increased strength. Additionally, traditional portholes required the use of a reinforcing material such as a wire or nylon mesh to provide sufficient strength relative to the size of the portholes. As will be appreciated, portholes disclosed herein (e.g., porthole 150) enable a larger viewing area to see into or out of the pool, which is unobstructed by a wire or nylon mesh or any other reinforcing material, thus making the portholes more desirable.

According to various embodiments of the present disclosure, portholes achieve increased strength according to the material of window sheet 500. Thus, in some embodiments, window sheet 500 can comprise a plastic material, such as PVC, in addition to a plasticizer material. As would be appreciated by one of skill in the art, the addition of a plasticizer would reduce the brittleness of the pure PVC material and increase the overall material strength of the window sheet (e.g., window sheet 500). Suitable examples of a plasticizer can include, but are not limited to: sebacates, adipates, terephthalates, dibenzoates, gluterates, phthalates, azelates, acetamide, acetlytributylcitrate, benzyl benzoate, benzyl butyl phthalate, diethylhydroxylamine (DEHA), dioctyl phthalate (DOP), bisphenol A, bisphenol AF, dibutyl phthalate, dibutylsebacate, diethylene glycol dinitrate, diisobutyl phthalate, diisodecyl phthalate, diisononylphthalate, dimethyl adipate, dimethyl methylphosphonate, dioctyl adipate, dioctyl terephthalate, dipropylene glycol, epoxidized soybean oil, ethyl butyrate, ethylene carbonate, precipitated silica, polybutene, tricresyl phosphate, triethyl phosphate, N-vinylacetamide, or any combination thereof, in addition to plasticizers not explicitly disclosed can be used.

For example, in some embodiments, window sheet 500 can be made of PVC with the addition of dioctyl phthalate (DOP) and epoxidized soybean oil as plasticizers for added material strength. Again, the addition of a plasticizer increases the flexibility and durability of window sheet 500. As will be appreciated, such an embodiment can provide numerous advantages, such as retaining structural integrity and resisting rupture while also being a flexible and easily collapsible material that provides improved transparency. In other words, window sheets of the present disclosure may be bent, flexed, and strained during storage and packaging, but will remain robust and structurally sound when the pool is filled and in use while also providing improved visibility.

As discussed, portholes 150 may aid in safety as they may enable improved viewing into pool 100 through side wall 120. For example, the window sheet in the portholes 150 can comprise at least a plastic material and a plasticizer to provide sufficient strength to eliminate the need for a mesh or reinforcing material.

If the portholes 150 are removably designed by suitable means, a porthole 150 also may be used as a drainage device, enabling quick emptying of the liquid of the pool 100. Thus, the portholes 150 may be integrally formed during manufacturing of the side wall 120, or may be removable, wherein the various sheets are removably attached via a waterproof and leak-proof method. The portholes 150, however, may also be attached via a non-removable method.

In some embodiments, window sheets of the present disclosure can comprise a plasticizer in an amount suitable to confer certain material properties to the window sheet. Again, one of skill in the art will understand that window sheets, side walls, and welds connecting the window sheets and side wall as disclosed herein are under immense stress from hydrostatic forces of the water in a pool. The certain material properties that can be conferred based on the addition of a plasticizer to the window sheet can include, but are not limited to: tensile strength, yield strength, elastic modulus, stress, strain, distortion, and other properties as will be recognized by one of skill in the art.

In some embodiments, the transparent material of the present disclosure can present a tensile strength of 2600 kPa or greater (e.g., 2650 kPa or greater, 2700 kPa or greater, 2750 kPa or greater, 2800 kPa or greater, 2850 kPa or greater, 2900 kPa or greater, or 2950 kPa or greater). In some embodiments, the transparent material can present a tensile strength from 2500 kPa to 3000 kPa (e.g., from 2500 kPa to 2600 kPa, from 2600 kPa to 2700 kPa, from 2700 kPa to 2800 kPa, from 2800 kPa to 2900 kPa, or from 2900 kPa to 3000 kPa). Additionally, in some embodiments, the transparent material can undergo an elastic deformation of 6 mm or less (e.g., 5.9 mm or less, 5.8 mm or less, 5.7 mm or less, 5.6 mm or less, 5.5 mm or less, 5.4 mm or less, 5.3 mm or less, 5.2 mm or less, 5.1 mm or less 5 mm or less, 4.5 mm or less, 4 mm or less, 3 mm or less, or 2 mm or less) when under a tensile force of 19000 gram-force or greater.

Additionally, the weld strength of the welds connecting the sidewall and the window sheets can be evaluated using certain properties, including but not limited to: tensile strength, yield strength, elastic modulus, stress, strain, distortion, and others. In some embodiments, the transparent material can present a tensile strength of 2000 kPa or greater (e.g., 2050 kPa or greater, 2100 kPa or greater, 2150 kPa or greater, 2200 kPa or greater, 2250 kPa or greater, 2300 kPa or greater, 2350 kPa or greater, or 2400 kPa or greater). In some embodiments, the transparent material can present a tensile strength from 2000 kPa to 2500 kPa (e.g., from 2000 kPa to 2100 kPa, from 2100 kPa to 2200 kPa, from 2200 kPa to 2300 kPa, from 2300 kPa to 2400 kPa, or from 2400 kPa to 2500 kPa). There are many methods for testing tensile strength and elastic deformation that are known to one of ordinary skill in the art.

According to the various embodiments, pool 100 may be made in a variety of shapes, including, but not limited to, circular, as shown in FIGS. 1, 3, and 4, elliptical, as shown in FIG. 2, rectangular, square, oblong, oval-shaped, elliptical, rectangular with rounded comers, and the like. Thus, it will be apparent to one skilled in the art that the configuration of the pool 100 may be many shapes. Additionally, pool 100 may be made in a variety of sizes. The varied sizes and shapes of pool 100 may result in pool 100 having more than one side wall 120 forming the perimeter of pool 100. Additionally, multiple side walls 120 may be employed as a means of providing varying amounts of transparency of pool 100.

Pool 100 may be a frame pool, as shown in FIGS. 3 and 4, or a pop-up type of pool, as shown in FIGS. 1 and 2, both of which are collapsible in nature. The pop-up pool is adapted to rise with the amount of water inserted into pool. In some embodiments, and as shown in FIG. 2, pop-up pool 100 may also be outfitted with external braces or frames 160 for additional support. The frame pool is typically pre-fabricated and includes a plurality of external vertical braces or frames for supporting the frame pool above the ground. As shown in FIGS. 3 and 4, frame pool 100 may comprise external vertical braces 310 and top brace 320. As one skilled in the art would appreciate, other types of pools may be used with the present technology.

As previously discussed, pool 100 can be formed from a base 110 and at least one side wall 120. Base 110 and side wall 120 may be formed from multiple varied materials. Base 110 and side wall 120 may be formed of the same material or different materials, and in embodiments involving more than one side wall 120, each side wall 120 may be formed of the same or different materials. For example, in some embodiments, base 110 and side wall 120 of pool 100 may be formed from a natural textile (e.g., burlap, jute, etc.) or synthetic material (e.g., plastic, polyurethane, PVC, nylon, etc.). In some embodiments, base 110 may be formed from a natural textile and side wall 120 may be formed of a synthetic material. Many materials (especially water-permeable textiles, etc.) may be used to construct a pool; the materials, however, should be treated to retain water. For example, such materials could be adhered to, laminated with, coated with, or bonded to a material impermeable to water. In accordance with the embodiment shown in FIG. 1, base 110 may be formed from a nylon shell, which may be laminated or otherwise treated to hold water. For example, the nylon shell might be bonded to another material, such as a polyurethane, PVC, vinyl, or other suitable impermeable lining to provide the desirable waterproof qualities, and to provide a more pleasing tactile quality to the interior of the pool 100. Similarly, side wall 120 of pool 100 may be constructed from these materials, or other materials having similar suitable qualities. Many of the materials that are used may be selected for their durability.

For example, base 110 may be formed from materials that are more durable than the side wall 120, as this section of pool 100 would likely be subjected to more wear than that experienced by side wall 120. Also, as described, base 110 and side wall 120 may be formed from a combination of materials, which may be adhered or bonded together. The materials used for the various portions of pool 100, including, for example, base 110 and side wall 120, may be joined by way of a number of commonly known suitable techniques, such as sewing, adhesives, bonding, lamination, RF welding, other suitable joining techniques, and the like. The connection of base 110 to side wall 120 may be along the bottom 122 of side wall 120. Base 110 can include a perimeter, wherein side wall 120 may be connected about the perimeter of base 110.

In some embodiments, side wall 120 may include an inner wall 126 and an outer wall 128. Inner wall 126 may be sealable to outer wall 128 by welding, adhesives, or the like. Side wall 120 may be inflatable or non-inflatable. Further, side wall 120 may be non-spring activated.

In some embodiments, a large portion of side wall 120 may be transparent in nature. Such a portion would be larger than the portholes 150 and would comprise a portion or all of side wall 120 itself. In some embodiments, half of side wall 120 may be transparent in nature. In some embodiments, the entirety of side wall 120 may be transparent. Side walls 120 that have a substantial transparent portion are more desirable to consumers as they enable a significantly larger viewing area, enabling clear visuals into or out of the pool.

In some embodiments, side wall 120, having a substantial portion being transparent, may comprise clear window sheet 500 attached between clear inner wall 126 and clear outer wall 128. In some embodiments, multiple clear window sheets 500 of sufficient size may be welded together to form a unified side wall 120. In some embodiments, a single clear window sheet 500 of sufficient thickness may form unified side wall 120. In some embodiments, unified side wall 120, having a substantial portion being transparent, can take the place of side wall 120 with portholes 150, with all other components of pool 100 attaching to side wall 120 as described elsewhere in this disclosure. In some embodiments, side wall 120 can comprise a plurality of side wall sections (e.g., two or more side wall sections). In some embodiments, multiple clear window sheets 500 of sufficient size may be welded together to form a side wall section. In some embodiments, some side wall sections can be transparent while other side wall sections can be solid. For example, the side wall sections can alternate between transparent and solid or be arranged in any other pattern. As would be appreciated by one of ordinary skill in the art, such an embodiment would provide greater transparency than simply having portholes and provide another level of user customization to arrange the transparent side walls sections as desired.

In some embodiments, side wall 120 (or inner wall 126 or outer wall 128) may also be a clear flexible polymer, such as flexible PVC. In some embodiments, the use of two similar materials may make attaching window sheet 500 and side wall 120 easier and also increase the strength of the attachment, as using similar materials will make easier the use of high-frequency welding or similar techniques to attach the various materials together. In some embodiments, the unitary transparent sidewall can be welded directly to the base. In some embodiments, the transparent side wall sections can be welded directly to non-transparent side wall sections. In some embodiments, the sidewall can comprise the window sheet materials. The window sheet materials are previously disclosed. As previously stated, the addition of a plasticizer would increase the flexibility and durability of the transparent side wall. Such an embodiment can provide numerous advantages, such as retaining structural integrity and resisting rupture while being a flexible and easily collapsible material. In other words, in such an embodiment, the transparent side wall may be bent, flexed, and strained during storage and packaging, but will remain robust and structurally sound when the pool is filled and in use.

Pool 100 illustrated in FIG. 1 may further include a flotation device 130, which is formed in the shape of pool 100, attached to the top 124 of side wall 120. According to an embodiment shown in FIG. 1, floatation device 130 may be an inflatable ring. This inflatable ring 130, when inflated, may provide some stiffness at the top 124 of side wall 120, and may help maintain the overall shape of pool 100. Moreover, inflatable ring 130 may provide padding for those entering and exiting pool 100 and may also provide a manner by which pool 100 changes from a collapsed to an expanded configuration with the addition of water within pool 100. Additionally, as floatation device 130 may be buoyant, it may be made to rise with the level of water within pool 100, such that as water is deposited in pool 100 and flotation device 130 rises with the level of that water, side wall 120 is automatically erected as pool 100 is filled.

Flotation device 130 may be made from a variety of materials. For example, floatation device 130 may be a standard inflatable polyurethane casing, or similar casing that is suitable for retaining air or other gas in an inflated state. Additionally, flotation device 130 may make use of a variety of chemical or other reactions that would automatically inflate it. Flotation device 130 may be inflated by conventional means, for example by a valve configured for oral inflation or for inflation by a device such as a pump, and the like.

Flotation device 130 may also be made from material that does not require inflation but provides adequate buoyancy and floats on the water contained within pool 100 (or other liquid when the pool is used as a general container). For example, special foams, polystyrene, or other materials may be used to create a flotation device 130, which would float with the water line contained in pool 100 and cause side walls 120 to be erected as pool 100 fills. In this manner, pool 100 may automatically change from a collapsed to an expanded configuration. As pool 100 is a collapsible pool, and adapted to be folded, flotation device 130 may be made of a material that may be subjected to folding, without becoming damaged. Those skilled in the art will appreciate that, although some potential materials from which flotation device 130 may be formed have been mentioned above, other materials including, but not limited to, newly developed materials may be incorporated within the design of the technology and used to form flotation device 130 without departing from the disclosed technology.

It will be appreciated by those skilled in the art that flotation device 130 may be of a nature other than an inflatable ring. For example, this floatation device 130 may be made of a material that floats, and is bendable, such that it may be folded or bent.

Pool 100 may be conveniently collapsed for storage and/or transport by deflating the inflatable ring 130 and folding onto itself along with base 110 and side wall 120 material in a manner that is well known.

Pool 100 may further include a pump device 140. Pump device 140 can be adapted as a circulation system, and beneficially a cleaning system. Pump device 140 comprises a first tube 142 coupling a suction port of pump 140 in fluid communication with a main drain or mobile cleaning device (neither shown) which draws water and settled debris from the bottom of the pool. Pool pump 140 may further comprise a second tube 144 to a coupling device which diverts a small portion of pool “return” water pumped from an outlet port of pump 140. Further, pump 140 may be adapted to provide a jet of air bubbles in the water, for a Jacuzzi or spa effect.

FIG. 2 illustrates a pool 100 having a brace or structural support 160. Support 160 may include vertical rib supports and may be coupled proximate to side wall 120 of pool 100. For example, support 160 may be inserted within the material making up side wall 120. The support members may comprise at least a portion of flotation device 110 or a support member and may have at least a portion coupled to the top of side wall 120 and vertically along side wall 120 to provide buoyancy and/or rigidity to side wall 120. Support members 160 may comprise, for example, one or more inflatable bladders, collapsible foam, removable support members, or the like. FIG. 2, also, depicts oval shaped portholes 150.

One skilled in the art would appreciate that support members 160 may be used on a frame pool, as well as a pop-up pool for supporting the pool above the ground. In some embodiments, support members 160 are positioned outside of pool 100.

The pool 100 may include a ladder 170 to enable one to enter and/or exit the pool 100. The ladder 170 may be integral with the brace 160, or not. The ladder 170 may further be insertable into the pool 100, enabling one to exit the pool 100. Because a rim of the pool 100 is above the ground, the ladder 170 is preferably flush with the rim for easy entry/exit from the pool 100.

Because pool 100 is collapsible, the liquid in pool 100 should be drainable. Preferably, a drainage assembly 180 is integral with pool 100. In some embodiments, drainage assembly 180 is a cork or like device, that is removeable from pool 100, such that, when removed the water from pool 100 may be drained. Drainage assembly 180 may also be a valve enabling control of draining pool 100. One skilled in the art would appreciate that drainage assembly 180 may be many devices enabling easy draining of pool 100, safely and environmentally.

Methods of manufacturing and assembling a pool 100 are also within the scope of this disclosure. In some embodiments, for example, pool 100 may be manufactured as is known in the art, with additional method steps added to provide portholes 150. For example, an aperture may be cut in side wall 120. Window sheet 500 may be attached to side wall 120 as described above by welding, adhesives, or other known methods. In some embodiments of pool 100 having an inner wall 126 and an outer wall 128, window sheet 500 may be attached to inner wall 126 only, between the inner wall 126 and the outer wall 128, or to outer wall 128 only.

In some embodiments, one or more welds 510 may be used to secure window sheet 500 to side wall 120 or between inner wall 126 and outer wall 128. Welds 510 may be made around the perimeter of the aperture in side wall 120. In some embodiments, a plurality of welds 510 is employed. These welds 510 may be oriented in any way sufficient to provide a water tight seal. In some embodiments, welds 510 may be arranged in a concentric manner around the aperture in side wall 120 as illustrated in FIGS. 5a and 5 b. This arrangement allows one or more of welds 510 to fail, while still retaining a watertight seal around porthole 150.

EXAMPLE 1 Materials and Methods

In an example configuration, a polyvinyl chloride (PVC) resin is mixed with a dioctyl phthalate (DOP) plasticizer and an epoxidized soybean oil plasticizer, along with a Barium-Tin (Ba—Sn) stabilizer to form a transparent window sheet. The window sheet comprises 68.4% PVC, 28.2% DOP, 2% epoxidized soybean oil, and 1.4% stabilizer. The transparent material was cut into various dimensions with 2-millimeter thickness for testing according to the parameters in Table 1 and put into use in a 15-foot test pool for 13 days to test for durability. Results are also shown in Table 1 below:

TABLE 1 Durability Test for Various Window Cuts direction day 0 day 2 day 8 size size without window die cut of size size day 6 size day 13 change change size shape size size (mm) stretching (mm) (mm) size (mm) (mm) size (mm) (mm) (mm) 1 ∅ 12”

304.8 (12”) 304.8 (12”)

307.5 307.5 310   333   310   334   310   334   310   335    +2.5 +27.5 307.5 307.5 2 ∅ 14”

355.5 (4”) 330.2 (13”)

360.5 331.5 361   363   361   364   361   365   361   365.5  +0.5 +34   360.5 331.5 3 ∅ 16”

406.4 (16”) 374.6 (14.75”)

410   377   410   415   410   416   410   416.5 410.5 417.5  +0.5 +40.5 410   377   4 ∅ 18”

457 (18”) 425 (16.75)”

456   423.5 460   461.5 461   463   461   463   461.5 464    +5.5 +40.5 456   423.5 5 ∅ 19”

482.6 (19”) 444.6 (17.5”)

484.5 445.5 488.5 488.5 489   490   489   490   489   491    +4.5 +65.5 484.5 445.5 6 18” × 12”

305 (c = 10) 457

307   457.5 311.5 471   311.5 472   311.5 472   311.5 473    +4.5 +15.5 307   457.5 7 21” × 14”

356 (c = 15) 533

358.5 502.5 364   541   364   543   364   543   364   543.5  +5.5 +41   358.5 502.5

As shown, all samples underwent stretching while under a hydrostatic load for the duration of the test. But the size change in the vertical direction for all samples was found to be minimal as no sample stretched more than 5.5 mm in the vertical direction. Further in the horizontal direction, the samples generally completed elongation after day six, continuing to stretch a negligible amount or not at all. As such, the samples in question satisfy the robustness and durability requirements for use in above-ground pools while still providing ample transparency to provide visibility into or out of the pool.

Additionally, four window sheets were cut to rectangular dimensions 53×35×2 mm from the transparent material and placed in a standard tensile test to test for vertical and horizontal tensile strength. Results of the vertical and horizontal tensile tests can be found in FIGS. 8a and 8 b, respectively. Tabulated data for the vertical and horizontal tensile tests is shown in Tables 2 and 3. The resulting data show good agreement with the durability tests and further demonstrate the robustness of the transparent material.

TABLE 2 Vertical Tensile Test Max. Tensile Deformation Max. Force Strength at Max. Elongation Sample (gf) (kPa) Force (mm) (%) 1 17276.062 2420.29 5.06 9.548 2 18720.005 2622.579 5.062 9.552 3 18816.029 2636.032 5.071 9.568 4 18240.038 2555.338 5.051 9.531 Min. 17276.062 2420.29 5.051 9.531 Avg. 18263.034 2558.56 5.061 9.55

TABLE 3 Horizontal Tensile Test Max. Tensile Deformation Max. Force Strength at Max. Elongation Sample (gf) (kPa) Force (mm) (%) 1 19848.08 2780.617 5.063 9.553 2 19328.008 2707.757 5.057 9.542 3 19240.09 2695.44 5.064 9.555 4 20240.025 2835.526 5.051 9.531 Min. 19240.09 2695.44 5.051 9.531 Avg. 19664.051 2754.835 5.059 9.545

For comparison, four samples of non-transparent side wall material used in the pool were cut to dimensions 60×35×1.1 mm and tested in a standard tensile test for a baseline performance. Results of the tensile test can be seen in FIG. 9, along with tabulated data for the tests below in Table 4.

TABLE 4 Tensile Test for Side Wall Material Max. Tensile Deformation Max. Force Strength at Max. Elongation Sample (gf) (kPa) Force (mm) (%) 1 17236 4390.323 22.72 37.866 2 13516.049 3442.783 8.268 13.78 3 18768.041 4780.561 3.524 5.874 4 16640.073 4238.529 3.358 5.597

Further, two samples of the transparent material were welded to the side wall material to test the weld strength under a standard tensile test. Results of the welded tensile test can be seen in FIG. 10, along with tabulated data for the tests below in Table 5. As shown, the tensile strength of the weld between the transparent material (i.e., the window) and the side wall is comparable to the tensile strength of the material itself, providing for a robust and durable connection.

TABLE 5 Welding Tensile Test Max. Tensile Deformation Max. Force Strength at Max. Elongation Sample (gf) (kPa) Force (mm) (%) 1 16004.061 2038.263 9.381 15.635 2 19348.022 2464.146 6.349 10.582

An embodiment of the present disclosure can be implemented according to at least the following:

Clause 1: A pool comprising: a base; a side wall joined to the base, the side wall comprising: an aperture; an outer wall; and an inner wall, the inner wall capable of sealing to the outer wall; and at least one porthole comprising: a first window sheet layer made from a plastic; and a second window sheet layer made from the plastic, the at least one porthole being disposed between the inner wall and the outer wall and attached thereto by at least two welds that are each continuous around the perimeter of the aperture, wherein the porthole is configured to substantially cover the aperture.

Clause 2: The pool of clause 1, wherein the window sheet is transparent, and the side wall is not transparent.

Clause 3: The pool of clause 1 wherein the plastic comprises polyvinyl chloride (PVC) and a plasticizer.

Clause 4: The pool of clause 1, wherein the plastic confers to the at least one porthole a tensile strength of 2000 to 3000 kPa when the at least one porthole undergoes a tensile test in one or more of a horizontal or vertical direction.

Clause 5: The pool of clause 1 wherein the at least one porthole can withstand an applied force of up to 20,000 gf before failing.

Clause 6: The pool of clause 1, wherein the at least two welds include three welds that are continuous around the perimeter of the aperture.

Clause 7: The pool of clause 1, wherein the side wall comprises two or more side wall sections.

Clause 8: The pool of clause 7 wherein each of the two or more sidewall sections comprises a porthole.

Clause 9: The pool of clause 1, wherein the side wall comprises a unitary side wall sheet.

Clause 10: A pool comprising: a base; a side wall comprising: a first side wall section having a first edge, the first side wall section comprising: an outer wall; and an inner wall, the inner wall capable of sealing to the outer wall; and a second side wall section having a second edge, the second side wall section comprising: a first window sheet layer made from a plastic; and a second window sheet layer made from the plastic, wherein the second edge of the second side wall section is configured to join the first edge of the first side wall section at a joint and be attached thereto by at least two welds that are each continuous along the joint, wherein each side wall section is joined to the base.

Clause 11: The pool of clause 10, wherein the second side wall section is transparent, and the first side wall section is not transparent.

Clause 12: The pool of clause 10, wherein the plastic comprises polyvinyl chloride (PVC) and a plasticizer.

Clause 13: The pool of clause 10, wherein the second side wall section has a tensile strength from 2000 to 3000 kPa when the second side wall section undergoes a tensile test in one or more of a horizontal or vertical direction.

Clause 14: The pool of clause 10, wherein the second side wall section can withstand an applied force of up to 20,000 gf before failing.

Clause 15: The pool of clause 10, wherein the first side wall section is joined to one or more adjacent side wall sections and the base by one or more welds that are continuous around the perimeter of the first side wall section.

Clause 16: The pool of clause 10, wherein the first side wall section comprises a porthole containing an aperture and a window sheet disposed within the aperture.

Clause 17: The pool of clause 16, wherein the window sheet is joined to the aperture through one or more welds around the perimeter of the aperture.

Clause 18: The pool of clause 10, wherein the window sheet is made from the plastic.

Clause 19: A pool comprising: a base; and a side wall comprising a window sheet comprising a transparent material including a plastic and a plasticizer, and the side wall forming a unitary transparent sheet configured to enclose an interior area of the pool, wherein the side wall is joined to the base through one or more welds.

Clause 20: The pool of clause 19, wherein the plastic comprises polyvinyl chloride (PVC).

Clause 21: The pool of clause 19, wherein the side wall has a tensile strength from 2000 to 3000 kPa when the first window sheet undergoes a tensile test in one or more of a horizontal or vertical direction.

Clause 22: The pool of clause 19, wherein the side wall can withstand an applied force of up to 20,000 gf before failing.

Clause 23: The pool of clause 19, wherein the side wall further comprises a flotation device having the shape of the interior area of the pool and disposed around a top portion of the side wall.

Clause 24: The pool of clause 23, wherein the flotation device comprises the transparent material.

Clause 25: A pool comprising: a base; and a side wall joined to the base, the side wall comprising: an aperture; and at least one porthole substantially covering the aperture, the at least one porthole comprising: a first window sheet layer made from a plastic; and a second window sheet layer made from the plastic, the at least one porthole covering the aperture and attached to the side wall by at least two welds that are each continuous around the perimeter of the aperture.

Clause 26: The pool of clause 25, wherein the plastic confers to the at least one porthole a tensile strength of 2000 to 3000 kPa when the at least one porthole undergoes a tensile test in one or more of a horizontal or vertical direction.

Clause 27: The pool of clause 25 wherein the at least one porthole can withstand an applied force of up to 20,000 gf before failing.

While the present disclosure has been described in connection with a plurality of exemplary aspects, as illustrated in the various figures and discussed above, it is understood that other similar aspects may be used, or modifications and additions may be made to the described aspects for performing the same function of the present disclosure without deviating therefrom. For example, in various aspects of the disclosure, methods and compositions were described according to aspects of the presently disclosed subject matter. However, other equivalent methods or composition to these described aspects are also contemplated by the teachings herein. Therefore, the present disclosure should not be limited to any single aspect, but rather construed in breadth and scope in accordance with the appended claims. 

1. A pool comprising: a base; a side wall joined to the base, the side wall comprising: an aperture; an outer wall; and an inner wall, the inner wall capable of sealing to the outer wall; and at least one porthole comprising: a first window sheet layer made from mixing a plastic and a plasticizer, wherein the first window sheet layer is configured to be transparent; and a second window sheet layer made from mixing the plastic and the plasticizer, wherein the second window sheet layer is configured to be transparent, the at least one porthole being disposed between the inner wall and the outer wall and attached thereto by at least two welds that are each continuous around the perimeter of the aperture, wherein the porthole is configured to substantially cover the aperture.
 2. (canceled)
 3. The pool of claim 1, wherein the plasticizer comprises at least one of sebacates, adipates, terephthalates, dibenzoates, gluterates, phthalates, azelates, acetamide, acetlytributylcitrate, benzyl benzoate, benzyl butyl phthalate, diethylhydroxylamine, dioctyl phthalate, bisphenol A, bisphenol AF, dibutyl phthalate, dibutyl sebacate, diethylene glycol dinitrate, diisobutyl phthalate, diisodecyl phthalate, diisononyl phthalate, dimethyl adipate, dimethyl methylphosphonate, dioctyl adipate, and dioctyl terephthalate.
 4. The pool of claim 1, wherein the plastic confers to the at least one porthole a tensile strength of 2000 to 3000 kPa when the at least one porthole undergoes a tensile test in one or more of a horizontal or vertical direction.
 5. The pool of claim 1, wherein the at least one porthole can withstand an applied force of up to 20,000 gf before failing.
 6. The pool of claim 1, wherein the at least two welds include three welds that are continuous around the perimeter of the aperture.
 7. The pool of claim 1, wherein the side wall comprises two or more side wall sections.
 8. The pool of claim 7, wherein each of the two or more sidewall sections comprises a porthole.
 9. The pool of claim 1, wherein the side wall comprises a unitary side wall sheet.
 10. A pool comprising: a base; a side wall comprising: a first side wall section having a first edge, the first side wall section comprising: an outer wall; and an inner wall, the inner wall capable of sealing to the outer wall; and a second side wall section having a second edge, the second side wall section comprising: a first window sheet layer made from mixing a plastic and a plasticizer, wherein the first window sheet layer is configured to be transparent, and a second window sheet layer made from mixing the plastic and the plasticizer, wherein the first window sheet layer is configured to be transparent, wherein the second edge of the second side wall section is configured to join the first edge of the first side wall section at a joint and be attached thereto by at least two welds that are each continuous along the joint, wherein each side wall section is joined to the base.
 11. The pool of claim 10, wherein the first side wall section is not transparent.
 12. (canceled)
 13. The pool of claim 10, wherein the second side wall section has a tensile strength from 2000 to 3000 kPa when the second side wall section undergoes a tensile test in one or more of a horizontal or vertical direction.
 14. The pool of claim 10, wherein the second side wall section can withstand an applied force of up to 20,000 gf before failing.
 15. The pool of claim 10, wherein the first side wall section is joined to one or more adjacent side wall sections and the base by one or more welds that are continuous around the perimeter of the first side wall section.
 16. The pool of claim 10, wherein the first side wall section comprises a porthole containing an aperture and a window sheet disposed within the aperture.
 17. The pool of claim 16, wherein the window sheet is joined to the aperture through one or more welds around the perimeter of the aperture.
 18. The pool of claim 10, wherein the window sheet is made from the plastic.
 19. A pool comprising: a base; a side wall comprising a window sheet comprising a transparent material made from mixing a plastic and a plasticizer, and the window sheet enclosing an interior area of the pool, wherein the side wall is joined to the base through one or more welds.
 20. (canceled)
 21. The pool of claim 19, wherein the side wall has a tensile strength from 2000 to 3000 kPa when the first window sheet undergoes a tensile test in one or more of a horizontal or vertical direction.
 22. The pool of claim 19, wherein the side wall can withstand an applied force of up to 20,000 gf before failing.
 23. The pool of claim 19, wherein the side wall further comprises a flotation device having the shape of the interior area of the pool and disposed around a top portion of the side wall, wherein the flotation device is formed of the transparent material. 24-27. (canceled) 